IKMF competition rule. Athlete Classification category.
Men's standard KB weights for ranked marathon/half marathon events: 24kg for 60-minute marathon (Open), 20kg for 60-minute marathon (Veteran 2), 32kg for 30-minute half marathon (Open MSWC/MS/CMS), 28kg for 30-minute half marathon (Veteran 1), 24kg for 30-minute half marathon (Veteran 2), 16kg for lower ranks. KB weights range from 16kg to 32kg depending on rank and age division.
See the interactive comparison on KETTLEBELL MONSTER™ for filterable views and more detail.